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Old 21st December 2012, 03:40 PM   #601
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I use my lab supply too. Plus 12V. I just soldered some thin cables to the battery holder. There is a small hole in the Allas where you can lead the cables out.
Otherwise the batteries are in nirvana in no time.
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Old 21st December 2012, 03:43 PM   #602
pdul is offline pdul  Denmark
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Another option is rechargeable batteries
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Old 21st December 2012, 03:56 PM   #603
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Sure.
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Old 21st December 2012, 05:07 PM   #604
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by pdul View Post
I use a rarely mentioned invention, called a powersupply for short PSU, to solve that problem.
Or maybe this Multiple-purpose power supply after computer is switched off - US Patent Application 20050050368 Description
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Old 21st December 2012, 08:16 PM   #605
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Whilst on the subject of swaps...

In my GB bag i did not receive any 147K resistors but I did get 4x 2k resistors that I don't think are anywhere on the boards. I also received 16x 150k when I only needed 4x.

Did anyone get more 147k than they needed and could they swap with me or if you don't need any swaps could you send me their spare 147's please?
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Old 22nd December 2012, 10:10 AM   #606
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Ok this is driving me nuts.

Has anyone completed a build using the R3 boards and the group buy parts? Cos all I have is two populated pcb's and not a single damn LED that lights up. Yes all Leds are correct way round and all are working when tested with Atlas DCR.

All 327 and 337 are correctly placed and everything else is in the right place.
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Old 22nd December 2012, 10:21 AM   #607
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Hi sq....,
some measuring done ?
Maybe a picture taken ?
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Old 22nd December 2012, 10:57 AM   #608
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Quote:
Originally Posted by sq225917 View Post

All 327 and 337 are correctly placed and everything else is in the right place.

Yet, something clearly is not in the right place. Check again.

If leds are not alight, your CCS is not working. Correct devices on the sink?
Input power ok?
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Old 23rd December 2012, 08:58 AM   #609
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There is no much difference between R3 and R2
Just a couple of footprints for J fets (easier on R3) and the input offset that is now on top of the board

Easy done to place a PNP in place of NPN and to get a capacitor the wrong way around
Did that myself
I wuld triple look at the transistors under the heath sink as well
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Old 23rd December 2012, 11:49 AM   #610
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Seriously guys, everything is in the right place. All the caps and LED's are the right way round and all the transistors are correctly placed. I've removed the heatsinks and checked everything.

I'll probe some voltages when i get back from my folks after Xmas.

It would be really nice if anyone else from the large group buy could say they had built the psu section on theirs and it worked.
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